Those really annoying people who, when you're cycling, don't overtake but drive behind you for ages really slowly and menacingly! Mainly old people. Could also apply to high-school stalkers..
Dani: Like... so we're going to work at 5ish?
Tanya: Yeah I think we can get there around 5.
Nina: 5 sounds okay but I'm thinking 5 or 5:30.
Lane: (on speakerphone) We're just snailtrailing, beaches!